| Patents for H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568) |
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| 02/07/1991 | WO1991001611A1 A method of subcarrier multiplication which preserves am information in fm systems |
| 02/07/1991 | WO1991001599A1 Single chip radio receiver with one off-chip filter |
| 02/07/1991 | WO1991001531A1 Proximity detecting apparatus |
| 02/07/1991 | DE3925001A1 Portable traffic broadcast receiver - has pilot signal thresholding to actuate loudspeaker, warning sounder, or to store message |
| 02/07/1991 | CA2016012A1 Selective stop device for a multi channel frequency switch |
| 02/07/1991 | CA2016011A1 Radio transceiver with optional dsplay |
| 02/07/1991 | CA2016010A1 Interchangeable control panels and keypads for radio transceivers and related process |
| 02/07/1991 | CA2016009A1 Method and apparatus for externally defining the operational mode of a digital radio transceiver |
| 02/06/1991 | EP0411485A2 Procedure for detecting multipath distortion of FM broadcast reception, and circuit arrangement for carrying out the procedure |
| 02/06/1991 | EP0411207A2 Digital receiver operating at sub-nyquist sampling rate |
| 02/05/1991 | US4991227 Squelch circuit with variable squelch tail and variable hysteresis |
| 02/05/1991 | US4991225 Slidable battery holder for simulated pager with concealed radio transmitter |
| 02/05/1991 | US4991165 Digital adaptive interference canceller |
| 02/05/1991 | US4990836 Motorized automobile antenna control device |
| 02/05/1991 | CA1279900C Amplitude modulated broadcast transmitter |
| 02/05/1991 | CA1279899C Security system with saw transmitter |
| 02/05/1991 | CA1279898C Spread-spectrum communication apparatus |
| 02/03/1991 | WO1991002418A1 Synthesized selective call receiver having variable characteristics |
| 02/02/1991 | WO1991002413A1 Radio receiver frequency control system |
| 02/02/1991 | CA2064895A1 Radio receiver frequency control system |
| 02/01/1991 | CA2004248A1 Digital receiver operating at sub-nyquist sampling rate |
| 01/30/1991 | EP0410663A2 AM noise reducing |
| 01/30/1991 | EP0410614A2 System for transmitting and/or receiving electromagnetic radiation employing resonant cavity including high Tc superconducting material |
| 01/30/1991 | EP0410245A2 Multi-Mode Electronic article Surveillance System |
| 01/30/1991 | EP0410193A1 Operation prohibition code for a car radio |
| 01/30/1991 | EP0409880A1 Actuator and communication system. |
| 01/30/1991 | EP0309451B1 Device to protect against interference signals |
| 01/30/1991 | EP0245337B1 Frequency doubling oscillator and mixer circuit |
| 01/30/1991 | CN2070517U Wireless sound frequency video frequency transmission device |
| 01/30/1991 | CN1011461B Ensemble modem structure for imperfect transmission media |
| 01/30/1991 | CN1011455B Bandwidth limiting ciruit with variable bandwidth |
| 01/29/1991 | US4989264 Bandwidth limiting circuit with variable bandwidth |
| 01/29/1991 | US4989262 Demodulator with multiple interference cancellers responsive to correlations between undesired signals and error signals |
| 01/29/1991 | US4989261 Power supply intercept with reference output |
| 01/29/1991 | US4989260 Transmitter with power reduction to compensate for varying radiated electric field strength when switching between batteries and AC power |
| 01/29/1991 | US4989243 Use in a public telephone |
| 01/29/1991 | CA2020901A1 Am noise reducing |
| 01/24/1991 | WO1991001048A1 Means for filter effect by diversity antenna |
| 01/23/1991 | EP0409819A2 Mobile telecommunication terminal |
| 01/23/1991 | EP0409538A2 Spread spectrum signal demodulator |
| 01/23/1991 | EP0409263A2 Radio apparatus, read/write device and method for reading/writing an identification code in the radio apparatus |
| 01/23/1991 | EP0409171A2 Diversity receiving system for use in digital radio communication with means for selecting branch by estimating propagation path property |
| 01/23/1991 | EP0409142A2 FSK data waveform shaping circuit |
| 01/23/1991 | EP0409100A2 Process for radio-broadcasting and detecting a video signal with at least two associated audio signals, for the modulation and separate use of at least one of said audio signals, and related demodulation device |
| 01/23/1991 | EP0247087B1 Portable two way radio with split universal device connector apparatus |
| 01/23/1991 | CN2070064U Push-button tuning radio |
| 01/23/1991 | CN1048776A Ensemble modem structure for imperfect transmission media |
| 01/23/1991 | CN1048775A Ensemble modem structure for imperfect transmission media |
| 01/23/1991 | CN1048774A Ensemble modem structure for imperfect transmission media |
| 01/22/1991 | US4987606 Wide band transmission system with biasing of gain control circuit |
| 01/22/1991 | US4987605 Radio receiver incorporating automatic means for setting broadcast standard |
| 01/22/1991 | US4987594 Stand-alone utility device with antitheft code with method for its use |
| 01/22/1991 | US4987317 System for putting electronic units connected to a communications channel into an operational state or into a stand by state |
| 01/22/1991 | US4986499 Radio installation kit with convertible front panel |
| 01/21/1991 | CA2021481A1 Method of subcarrier multiplication which preserves am information in fm systems |
| 01/18/1991 | WO1991001594A1 Combined bias supply and power shut-off circuit |
| 01/18/1991 | CA2064085A1 Combined bias supply and power shut-off circuit |
| 01/17/1991 | DE4019529A1 Headset outfit microphone mount and 2 earphones - has hoop shaped to fit over helmet with transducers held clear of outermost plane of ear |
| 01/17/1991 | DE3922626A1 Input band filters circuit for TV receiver - has common inductance, acting as oscillation circuit inductance for filters |
| 01/17/1991 | DE3922041A1 Remote control using microprocessor - with memory cells retaining various programs for remote control of several, different electronic appts. |
| 01/16/1991 | EP0408066A2 Television tuner |
| 01/16/1991 | EP0407919A2 Optical transmitters linearized by means of parametric feedback |
| 01/16/1991 | CN2069635U Full waveband radio capable of receiving vhf television accompanying sound |
| 01/15/1991 | US4985904 High speed switching system in a radio-communication system including a plurality of main communication systems and a plurality of stand-by communication systems |
| 01/15/1991 | US4985899 Intercept detector for spread-spectrum signals |
| 01/15/1991 | US4985689 Microwave semiconductor switch |
| 01/15/1991 | CA1279124C Program identification method and apparatus |
| 01/10/1991 | DE4019659A1 Digital equaliser with shifters - transmits input as output signal only in specified clock pulse signal flank configuration |
| 01/09/1991 | EP0407263A1 Receiving system for TV signals which are retransmitted by satellites |
| 01/09/1991 | EP0407146A2 Improved hybrid directional coupler for a radar system |
| 01/09/1991 | EP0407135A2 Apparatus for controlling transmission output level for burst signal |
| 01/09/1991 | EP0406851A2 Station selecting apparatus |
| 01/09/1991 | EP0406486A1 Control system for controlling consumer apparatus, in particular audio and/or video apparatus and consumer apparatus for use in such control system |
| 01/09/1991 | EP0406423A1 Method for transmission and reception of reflex-modulated signals |
| 01/09/1991 | EP0115499B1 Selective call paging and priority signalling system |
| 01/09/1991 | CN2069185U Dual purpose device with audio and medium frequency |
| 01/09/1991 | CN1048473A Digital transmission system transmitter and receiver for use in transmission system, and record carrier obtained by means of transmitter in form of recording device |
| 01/08/1991 | US4984296 Tuned radio apparatus |
| 01/08/1991 | US4984295 Programmable electronic device |
| 01/08/1991 | US4984291 Coded communication system with shared symbols |
| 01/08/1991 | US4984253 Apparatus and method for processing simultaneous radio frequency signals |
| 01/08/1991 | US4984219 Method and apparatus for decoding of frequency inversion based scramblers |
| 01/08/1991 | US4983820 Interface for receiving electronic tokens |
| 01/07/1991 | CA2020573A1 Hybrid directional coupler for a radar system |
| 01/05/1991 | WO1991000646A1 Receiving system for satellite-transmitted television signals |
| 01/05/1991 | CA2035445A1 System for receiving tv signals transmitted by satellite |
| 01/02/1991 | EP0405783A2 Burst mode transmitter/receiver unit |
| 01/02/1991 | EP0405743A2 Bidirectional transceiver for high speed data system |
| 01/02/1991 | EP0405445A2 Output waveform control circuit |
| 01/02/1991 | EP0405349A2 Transmitter and/or receiver apparatus |
| 01/02/1991 | EP0404778A1 Frequency control system |
| 01/02/1991 | EP0245363B1 Analog signal encoding and decoding apparatus and methods |
| 01/02/1991 | CN1011106B Radio receiver having wide-band automatic gain controlling circuit |
| 01/02/1991 | CN1011102B Multiple resonator component-mountable filter |
| 01/02/1991 | CA1278606C Transceiver with moisture resistant cover for thumbwheels and thelike |
| 01/02/1991 | CA1278526C Circuit arrangements for modifying dynamic range using action substitution and superposition techniques |
| 01/01/1991 | US4982444 Television tuning apparatus capable as serving selectively as a UHF tuner and a VHF tuner |
| 01/01/1991 | US4982442 Low cost antenna switch using relays configured in a transmit/receive arrangement |
| 01/01/1991 | US4982441 Radio communication system |
| 01/01/1991 | US4982431 Signal distinction circuit |